Abstract
Treatment of the Schiff bases 4-MeC 6H 4C(H)NCy (a), 3-Me-4-MeOC 6H 3C(H)N-2′,4′-6′-Me 3C 6H 2 ( b) or 2,4-Me 2C 6H 3C(H)N-2′,4′,6′-Me 3C 6H 2 (c) with palladium(II) acetate gave the cyclometallated complexes 1a, 1b and 1c. These reacted with NaX to give the halide-bridged complexes 2a, 2b and 2c (X = Cl), 3a, 3b and 3c (X = Br) and 4c (X = I). Reaction of the halide-bridged dimers with Ph 2PCH 2PPh 2(dppm), trans- Ph 2PCHCHPPh 2 ( trans-dppe), cis-Ph 2PCHCHPPh 2 ( cis-dppe) or Ph 2P(CH 2) 4PPh 2 (dppb), as appropriate in a dimer/diphosphine 1:1 or 1:2 molar ratio gave the dinuclear phosphine-bridged 4a, 5a, 4b, 5b, 5c– 7c and 8c– 10c and mononuclear 6a, 6b, 11c and 12c complexes, respectively. The structure of the bromo-bridged palladium(II) complex [ Pd{4-Me—C 6H 3C(H)N Cy}(Br)] 2 ( 3a) has been determined by X-ray crystallography. The structure has two asymmetrically bridging bromine atoms and a non-bonding Pd ⋯ Pd distance of 341.8(2) pm.
Published Version
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